Mixing machine for concrete mixtures and the like



Abi'il 21,19251 1,534,366

7 I H. B. EVANS MIXING MACHINE FOR CONCRETEMIXTURES AND THE LIKE Filed Sept. 27, 1922 3 Sheet s -$heet 1' fv VEN TOR.

April 21,1925.

, H. a. EVANS v I ixxmdncnms FOR concam's MIXTURES ND THE LIKE:

' Filed Sept. 27. 1922 a SheetSQ-Sheet' 2 F .11 j y mm v V flrr ENE) April 21, 1925. T534366 k H. B. EVANS MIXING MACHINE FOR CONCE QETE MIXTURES AND THE LIKE Filed Sept. 27. 1922 Sheets -Sheet 3 4 ATTORNEYS Patented Apr. 21, 1925.

UNITED STATES I PATENTOFFICE.

HOWARD B. EVANS, OF PORTLAND, OREGON.

MIXING MACHINE r012. ooNdnE'rE ivrr-x'rnnnsnnn THE LIKE.

Application filedsepteniber 27, 1922..,,Seria1 No. 590,902.

i To aZZ whom it may concern:

concrete mixers, and has for its main obj ect,

among others, the production of such a machlne winch 18 adapted to receive material I supplied to'the mixing chamber, and to make discharge thereof from either side of the machine at the will of the operator, or to receive said material'on oneside of the machine and make discharge thereof on the other; which is adapted to effect operation of the mixing-chamber with its axisdisposed at variable angles, and within all practicahie-bounds, irrespectively of the plane in which the supporting frame of the machine is disposed; which is contrived for ease and facility of manipulation in respect to the performance of all its functions which re quire manipulative direction or control; and which is light in weight and conveniently movable from place to place.

.An important feature of my invention also consists inftheprovision of a machine in which all its driving parts are, completely operative independently of the presence or absence of the mixing-chambe1z By this means provision is made for the mounting or demounting of the mixing-chamber from the machine without disturbing the assemblement of the mechanical workingparts,

My machine, within the scope of the foregoing general description and as hereinafter specified in detail, possesses anextraordinary efficiency or capacity for work in proportion to its size and to the cost of manufacture. At the same time, its simplicity of construction contributes materially tothe economy of its maintenance and cost of operation.

What constitutes my invention will be hereinafter. specified in detail and succinctly set forth in the appended claim.

In the accompanying drawings,in which my invention is illustrated in present preferred form of embodiment, 1

Figure I is a front elevation of mymachine, showing the mixing-chamber tilted for the discharge of its contents to one side of the machine.

Figure II isa similar view, showing the mixing-chamber in one position for mixing operation which is also adapted for receivmg a charge of material to be mixed from the side of the machine opposite to that towards which it is shown as discharging in I the preceding figure.

Figure III is a rear elevation of my machine substantially in the position of its parts shown in Figure I.

Figure IV is a top plan of my machine,

showing the mixing-chamber with its longitudinal axis in horizontal disposition.

Figure 'V is a side elevation of the ma chine as shown in Figure IV, looking towards the bottom of the mixing-chamber.

Figure VI is an edge elevation of the mixing-chamber tilting-lever of my machine detached from the machine, the quadrant with which it coacts being shown in section.

Referring to the numerals on the draw- 1l1gS,1 indicates a rear axle with which my machine is provided for the accommodation of a pair of supporting wheels 2.

From the axle 1 extends a medially disposed tongue 3, and an oblong rectangular frame 1, which may be to advantage constructed of angle iron. The frame 4; is provided, achacent to its forward corners, with legs 5, which are united, respectively, to the "tongue 3, as by braces 6. The tongue pref-' firmly mounted an upright frame 10, and

near the opposite end of the frame 4;, as upon across-piece 11, is mounted an upright frame 12, corresponding to the frame 10.

Carried in the upper portions of the frames 10 and 12, respectively, are suitably Journalled, oppositely extending, coaxial shafts 14- and 15, whose opposing ends are fixed to side bars 16 and 17, respectively. The said side bars constitute the side of a preferably rectangular loop, which is completed below by'a bottom-plate or cross-over l8, and which is surmounted by a square frame 19 to which the loop is securely at tached, in order toconstitute a tilting-frame. Within the frame 19 is securely confined a mixing chamber 20, whose bottom is suptween it and the cross-over 18 (see Figure IV). The said chamber preferably consists of a stout wooden barrel, which is provided on its inside with fixed plates 23, whose respective longitudinal axes are parallel to the longitudinal axis oi the barrel. My preference tor the use of barrel as a mixingchamber is due to the fact that it is desirable to construct said chamber of wood rather than metal as a preventative against adhesion of the concrete mixture to the side of the cl a iiber. The use 01" a barrel also afiords means its renewal whenever occasion may require, with minimum loss ol? time.

Within a housing 25, preterably located over the axle 1, is mounted any suitable moto;', not necessary to illustrate, whose power shaft 26, that is provided with an outside fiy-whecl 27, if desired, terminates in a driving pinion 28. The pinion 28 is geared, as by a sprocket belt 30, to a gear 31, 'fixed to a sleeve 29 upon the shaft 1 1, and is adapted to impart transverse rotation to the barrel 20 through rotation upon its supporting shafts 1 and o f the frame which comprises the side bars 16 and 17.

lVithin the frame last named, the barrel 20 is securely mounted so that it may rotate about its longitudinal axis. To that end it is provided, in a plane nearer to its open end, with an ani'iul-ar hoop-like track which is preferably circular in cross-section, and is securely fixed to the circumference of the barrel. l i it'h the said track, upon opposite sides of the barrel, respectively, engage, with rolling contact and barrel-supporting effect, a pair of grooved rollers 33 and 31, which are each ad ustably supported upon the frame 1-9, as by journal boxes 35 and 36, respectively. By aid of the adjustment of the tour rollers 33 and 34:, the longitudinal axis of the barrel may be made by adjustment to coincide with the axis o l? the sleeve 21.

lVithin the sleeve 21 is provided a shal t 38 fixed to the sleeve and by it to the bottom of the barrel. The shaft 38 works in a bearing provided for it in the bottom of: the plate 18 and carries a bevel gear 39 fixed to it. The gear 39 meshes with a bevel pinion 40, which is fixed to a shaft 41 carried in bearings 42 secured to the bottom plate 18, By aid of a gear 43 fixed to the shaft 41, a gear at fixed to the sleeve 29, and an intermediate sprocket chain 45 operatively uniting said gears, the barrel is adapted, in all positions of the side bars 16 and 17, relative to the axes 14- and 15, to be rotated about its longitudinal axis, with mixing etltect upon the contents of the barrel. It may be observed that said rotative motion of the barrel may be accomplished while the barrel is in any relative position in respect to the axle 1, for example, and that the rotation of the barrel may be thereby made effective either for mixing purposes, or for aiding, when the barrel is sufiiciently tilted, the discharge of the contents thereof.

In order to effect, upon occasion, the tilting of the barrel 20, I provide upon the outer end of the shaft 15 a lever 15, which in effect a double lever, extending as it does equidistantly upon opposite sides of the said shaft to which itis fixed. Said lever preterably terminates at one end in a hook 4:6 adapted to overhook a quadrant 17 fixed to the upright frame 12. Adjacent to each end of the lever a5 is a handle 18 which extends substantially at right angles to the lever. The handle adjacent to the hook 16 carries a bent lever 619, whose long arm extends in a grasp disposed inoperative proximity to the handle 18 it serves, and whose short arm actuates a stop-pin 50. Each stop-pin is adapted to reciprocate to and from the quadrant d? so as to engage or disengage one ot two series of pin-holes 51 provided at opposite ends, respectively, of the quadrant. A leaf spring 52 on the lever 45 serves, by engagement with the lever 49, to actuate that lever and the pin fastened to the end of the spring as shown in Figure VI.

I prefer to provide means for assisting in the tilting of the barrel in either direction when it is loaded, in order to relieve the operator in the manipulation of it and so as to throw it laterally in either direction. A simple means for the purpose indicated is found in a coiled tensile spring 53 loosely fastened at one end to the bar-rel supporting frame as indicated at 54-, and fastened at the other end, preferably in like manner, to the tongue as indicated at 55.

The operation of my machine may be briefly described as follows. After it is placed in position desired for doing its work, the open end oi the barrel being, for example, in the position shown in Figure II, material to be mixed is supplied to the interior ot the bi-vrrel. vDuring such filling o )eration the machine may continue in mo tion, or it may be stopped tor the occasion and afterwards set in. motion if desired. Atter the barrel is supplied with a charge to be mixed, it may be set so that its axis is in vertical position, but that is not necessary since the barrel may be effectively rotated, for mixing purposes, in any position in which, during its rotation, it will hold its contents without spilling.

In swinging the barrel from one position to another, as, for example, from that shown in Figure II to that shown in Figure I, the operator grasps with one hand the handle of the lever 45 that is uppermost, and the other handle with the other hand. Then, upon release from the quadrant of the handle 48 that is in engagement therewith, by a pull upon one handle and a push upon the other, the tilt of the barrel and its supporting framemay be adjusted to the desired angle,

and be there secured by engagement of a stop-pin 50 with one of the pin-holes 51 that is withinavailable reach of said pin.

In swingingthe barrel frame from one position to another as above specified, the power of the spring 53 becomes availableto compensate materially against the inertia or the weightof the load of the barrel,

whilethe momentum gained by the swinging of the barrel. readily overcomes the power of the spring so as to stretch 1t, 1f necessary,

and in effect to interpose it against shock,

after the manner of a yielding buffer.

l/Vhat I olalm 1s: In a mixing machine of the kind described,

the combination With a supporting frame,

supporting members thereon, a tilting-frame comprising side pieces, and opposite supiortin shafts o erativel connectin said ried in, the tilting-frame independently of the tilting of said frame, means foradjustably tilting the tiltingfra1ne in opposite directions, and a compensating tensile spring attached at one end to the tilting-frame and at the other end to the supporting frame.

In testimony whereof, Ihave hereunto set my hand in the presence of tWo snbscribing Witnesses.

HOWARD B. EVANS.

Witnesses:

JOSEPH L. ATKINS, JOHN B. GLELAND. 

